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Android is an operating system for touchscreen
smartphones; a mobile operating system (OS) that was
devised way back in 2003 by Andy Rubin and Rich Miner
only to sell it to Google, which first announced the launch
of Android in the year 2007. The Android operating
system consists of Java applications running on a Java
based object oriented application framework.
In simple terms Android is your desktop in a phone!
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Apart from the fact that an Android based OS is
exceptionally easy to understand & use, one of its
greatest advantages is that it makes available a large
User manual
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